Boeing B-52 Stratofortress variant
Boeing B-52 Stratofortress NB-52B
B-52B number 52-8, converted into an X-15 launch platform; it flew for NASA as "Balls 8" from 1966 to 2004.
Boeing B-52 Stratofortress sheet
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History
The NB-52B was B-52B serial number 52-8, converted into an X-15 launch platform. It flew as "Balls 8" in support of NASA research from 1966 until 17 December 2004, making it the oldest flying B-52B. It was replaced by a modified B-52H. Its engines were the same B-model Pratt & Whitney J57s, rated at 47 kN thrust each.